Off the shelf tune would be one you purchae from ZZP, Overkill, or Intense. It's a tune thats built up with typical settings to increase performance. But it doesn't take into consideration the behaviour and specifics of your car like a dyno tune would.
basically replacing the PCM which is located under your intake with a new one that has fuel and spark tuned accordingly... unless you have someone use a dyno on your vehicle then you don't replace anything
_________________ 2006 Impala LTZ 105k- Dynomax Catback Exhaust, Overkilled by Will
2001 Chevy Impala- 186K Retired: 180 T stat, HV3, Wizaired Intake, GMPP Exhaust, Speed Daddy Headers, 1.9 Yella Terra Rockers, Custom LED interior, BBEngineering.com 6 Pod Cluster, Poly Mounts and Bushings, Dyno Tuned by Dyno Brian @ Dyno Tune Motorsports 181 WHP 230 WTQ
You can always hang on to your PCM and eat the core charge if you are more comfortable doing so. No one will know its a tuned PCM unless you A) tell them or B)they hook it up to a tuner and look at the tables. I wouldn't be worried about emissions, most of us get PCMs so we can pass emissions (aftermarket cats trip codes and they are deleted for us).
Protip: If you don't know what you're doing, don't do it.
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